Bonalume Pop off E1Switch adjustable silent or noisy Abarth 500 595 695
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Bonalume Pop off E1Switch adjustable silent or noisy Abarth 500 595 695

Bonalume Pop off E1Switch adjustable silent or noisy Abarth 500 595 695

€292.80 €240.00 (tax excl.)
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Bonalume Pop off E1Switch adjustable silent or noisy Abarth 500 595 695


Bonalume builds this model in 3 types, with a noisy external vent, with a silent internal vent or the variant that can do both, i.e. be silent or noisy depending on the positioning of a lever on it.

This, the E1 switch is the version that by means of the lever can switch in an instant from silent to noisy (internal or external exhaust)


Referring to a supercharging system based on a turbocharger, the pop-off valve is placed on the compressor outlet duct, which compresses the intake air, this because in some situations the compressor can find itself compressing air that cannot be introduced into the engine (turbine in full expansion phase and gas valve closed, with engine speed rapidly decreasing), which causes an increase in the pressure upstream of the deactivated gas valve.

In this particular condition the turbocharger works in an area called "surge" or "pumping" (see the diagrams of the compressors) i.e. the compressor, failing to push the air forward, tends to wind itself on it, increasing the force on the thrust bearing up to when it breaks; moreover, the pressure peak which is created inside the intake manifold (the so-called "water hammer") can have deleterious consequences for it and for the engine. The pop-off valve serves precisely to let out the air that is not consumed and reduce the pressure downstream of the compressor to protect the turbocharger and the engine.

the data:

The need to create this new product did not arise from the mere request for a racing product, but rather from the actual problem of this valve originally installed in all the tjet engines of the Abarth-Fiat-Alfa-Lancia group. This, being a diaphragm, cannot withstand the high pressure and temperature peaks as required, causing it to break and at the same time invalidating the engine's performance both in acceleration and at full speed (power drops in acceleration).

Some problems also occur in the presence of a healthy diaphragm, but with higher turbine pressures (after ECU programming).

In the development of the project we have included the possibility for the customer to be able to choose between three types of air discharge (open ES1 - closed EB1 - switch both solutions with sound management). So at the time of purchase you can decide the most suitable configuration.

The characteristics of our E1 valve are decidedly very high, which in addition to being totally plug and play both in the mechanical and in the electrical and electronic parts, has some outstanding characteristics compared to the original product:

  •      No closing membrane, but piston in thermoplastic thermopolymer material for very high temperatures and performances (over 270° so no possibility of breakage);
  •      Low consumption and very high efficiency electromagnet (opening and closing times reduced by 20%);
  •      Operation guaranteed and tested at 3 bar with 170° inlet air temperature;
  •      Completely in automotive aluminum with very low lead content and anodized;
  •      Rotatable 360° on the support bracket, for a better positioning in the installation;
  •      IP67 watertight electrical connector and valve/solenoid body;
  •      Black color like the original, therefore difficult to identify and dispute;
  •      Guaranteed for 2 years in all its parts;
  •      Possibility and ease of installation also by the user customer;
  •      Available for all tjet engines of the group: Abarth-Fiat-Alfa-Lancia.


  • Abarth 500
  • Abarth 595
  • Abarth 695
  • Abarth 500c
  • Abarth 595c
  • Abarth 695c

Not compatible with US models


we always try to have the products available, if not the resorption has a wait of very few days

To offer you the best, we constantly improve our products in detail. The images may refer to a previous version.

Manufacturer Comments:

Since 1980 we have been involved in designing, manufacturing and distributing all the car components that replace the original parts with the aim of improving the performance and safety of your car. We completely redesign the original piece, creating a perfectly compatible Plug&Play replacement of a much higher level. The designed piece does not deteriorate and therefore is not periodically replaced, as is the case for many parts used in the processing field, when these parts are brought towards the search for an extreme performance improvement.

Compatibile con Modello:
Compatibile per Anno:
2014 - 2016
2017 - 2020
2104 - 2020
Dal 2017 in poi
Euro5 Dal 2021
Pre-restyling 2008 2015
Tutti gli anni di produzione
dal 2020
modelli restyling dal 2016 in poi

How to pay for an order

The accepted forms of payment, which will be shown during the order process in our e-commerce, are as follows:

1) By credit/debit card or PayPal account:
For payments by credit or debit card it is possible to use the PayPal system, an independent but very efficient and widespread service that is not perfectly secure in all the various phases of the transaction procedure. PayPal offers the possibility to pay with the most used credit cards, without any obligation to register on its platform and at no additional cost. For more information on the PayPal service:

2) Pay in 3 interest-free installments with Paypal:
Buy now and pay later with Paypal. Payment deferred in 3 installments, without interest, with direct debits to your credit card. First installment immediately, second installment after 30 days, third installment after 60 days. Easy, immediate and 100% secure. Payment method valid for orders up to 2000 euros. Pay in 3 installments eligibility is subject to Paypal approval.

3) Advance bank transfer:
By requesting it during the online shop wizard. Once the purchase has been confirmed, our system will send the relative order confirmation containing all the data necessary to complete the transaction. Using this form of payment, the order is expected to be shipped at the time of actual crediting, which can usually vary from 2 to 4 working days.

Conditions for resellers

Payment, shipping and discount conditions are confidential and are negotiated privately with each individual retailer.


We entrust our shipments to leading logistics partners. Each package, before being entrusted to the carrier, is checked and if necessary is equipped with additional packaging, both internally and externally.

Dropshipping: for some orders, in order to speed up delivery times as much as possible, we ask our supplier for direct shipping. For this reason it may happen that the sender is different from our address.

The shipment and delivery of the products will be carried out in many areas of the world. By finalizing the purchase, it will be possible to verify the coverage of your locality together with the calculation of the expected transport. If you have different needs, please contact us in order to estimate ad-hoc transport costs.

Once shipped, delivery times will be 24/48 working hours for Italy. While for other countries the delivery time will vary depending on the destination.

Shipping cost

Only for Italy will free shipping be offered to all purchases of an amount equal to or greater than € 300.00 including VAT, below this amount a shipping fee will be requested which will be calculated based on the volume weight of each item . For all other destinations, the transport price will be calculated at the time of the order based on the volume weight of the order and its destination.

For resellers, due to the offers offered, the shipping costs will always be charged, regardless of the purchase amount.

Free Transportation Insurance:

We offer all our customers an exclusive transport insurance which provides for the replacement of any breakage of the purchased material, caused exclusively by the courier during transport, at no additional cost. Without "trapping" the customer in lengthy paperwork, it will be sufficient to use the appropriate replacement request form - contact form - to allow us to organize collection from the address indicated by the customer which will coincide with the replacement of the insured material.

How to proceed to take advantage of the insurance:

As soon as the package is delivered, please carry out a scrupulous check in the presence of the courier. If the package arrives damaged on the outside, it does not mean that the inside is damaged, in any case it is recommended to sign the delivery note noting the wording "damaged package, acceptance subject to inspection". Subsequently, immediately carry out an internal check of the package within and no later than 2 days from receipt of the same. If any type of damage is found, immediately notify our staff so that we can take the necessary measures, i.e. the replacement of the damaged part or the entire product under warranty at no additional cost.

The replacement times for the insured material will vary according to the availability of the requested spare parts. In any case, these terms will fluctuate between 2 days and 30 working days from the request. Our staff will take care of keeping the customer updated on the procedure of the open file.

Return Policy

Every private customer who buys from our e-commerce has the unquestionable right to withdraw from the order according to the laws in force, within a maximum period of 14 non-working days from the date of delivery of the order, without the need to specify the reason. In the event of withdrawal, the customer has the right to request a refund of the amount paid, or (if he wishes) to request an exchange of the product of equal or greater value. The direct costs of returning the goods will be borne by the customer.

Exclusions from the right of withdrawal: The right of withdrawal applies exclusively to the private consumer, as per current laws. The right of withdrawal is not applicable if the buyer is a VAT holder who proceeds with the purchase as a company or professional. The right of withdrawal cannot be applied to personalized objects according to explicit directives of the customer.

How to exercise the right of withdrawal:

To obtain a refund (or to make an exchange) it is necessary to inform us of the intention to withdraw, within 14 non-working days from the delivery date, using the number +39 338 5261459, or by sending us a communication using the appropriate contact form. Subsequently it is essential that the material to be returned is sent at the customer's expense to: Bully Machines di Luis Bertelli, via di Campaldo, 10 - 56122 (PI) - Italy.

Important: For exercising the right of withdrawal, the customer is requested to send the products to our warehouses in the same state (like new) in which they were shipped by us, i.e. unused, unused installed, in the same packaging with which we shipped and complete with all accessory parts present inside the box at the time of shipment.

If the product(s) arrives used, spoiled or does not conform to the requested condition, we reserve the right to withhold a certain amount which will be equal to the decrease in the value of the goods. The customer is responsible for any decrease in the value of the goods, resulting from handling of the goods other than that necessary to establish the nature and characteristics.

The responsibility for the integrity of the goods during the return shipment is always the responsibility of the customer. We therefore invite you to insure all shipments destined for withdrawal.

Refund Timeline:

In the event of a refund request, the same will take place no later than 14 days from receipt of the material price at our office. Shipping costs will be reimbursed only if they have been paid at the time of purchase while the costs of returning the item are always to be understood as the responsibility of the customer who makes use of the withdrawal.

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